Exegesis:
legō humin ‘I tell you,’ cf. on 3.8.
ei kai ou dōsei autō anastas ‘even if he will not get up and give him.’ For anastas cf. on v. 7. Strictly speaking ei kai ou here is not introducing a supposition since it is clear from v. 7 that he will not give his friend because of their friendship.
dia to einai philon autou ‘because of (his) being his friend,’ articular infinitive.
dia ge tēn anaideian autou ‘because of his persistence.’ ge emphasizes the substantive which follows, i.e. anaideian.
anaideia lit. ‘shamelessness,’ or, ‘persistence,’ preferably the latter.
egertheis dōsei autō hosōn chrēzei ‘he will get up and give him whatever he needs.’ egertheis is equivalent to anastas. The phrase hosōn chrēzei may imply that he gave more than was asked for at first. chrēzō also 12.30.
Translation:
When vv. 5-7 have been rendered by conditional or suppositional clauses they are virtually elliptical; then the transition to v. 8 can best be made by indicating the ellipsis (e.g. by dots, Bahasa Indonesia RC), or by some phrase like, “Well, what then?” (Good News Translation). To take v. 8 as the apodosis of vv. 5-7 results in a construction that is usually too heavy to be a practical solution.
It is important to keep straight the pronominal references, i.e. to the one outside who has asked (A), and the one within who has been asked (B), respectively: B will not … give A anything because A is B’s friend, yet because of A’s importunity B will … give A whatever A needs. Probably the most practical way to do so is to refer to A by pronouns of the second person (as done by Moffatt, The Four Gospels – a New Translation, cf. also on vv. 5ff). — The structure of the two clauses in this verse differs in the position of the two causal phrases; this is done in order to emphasize the contrast between them. Where a more parallel clause structure is required the emphasis must be brought out by other means.
Not goes with both ‘to get-up/rise’ and ‘to give.’
Because he is his friend, or, ‘because of their friendship,’ or with a reciprocal form, e.g. ‘under name-of their being-friends-together’ (Trukese, similarly Batak Toba, Tae’ 1933).
Because of his importunity may be better rendered as a verbal construction, ‘because he (A) kept asking him (B),’ ‘because he insisted (or, asked persistently).’
He will rise may require an emphasizer, e.g. ‘he will certainly rise’ (Balinese), ‘he just has to rise’ (Batak Toba).
Whatever he needs, or, ‘all things he needs/wants/asks.’
Quoted with permission from Reiling, J. and Swellengrebel, J.L. A Handbook on the Gospel of Luke. (UBS Handbook Series). New York: UBS, 1971. For this and other handbooks for translators see here . Make sure to also consult the Handbook on the Gospel of Mark for parallel or similar verses.